They've hung out the 'Closed' sign on our old friend MobileMe, but Apple is still giving you the opportunity to download iDisk files and stored pictures for a limited time. In fact, if your iPhoto library is linked to your MobileMe account, iPhoto will take care of copying your galleries for you.
Just launch iPhoto (version 9.2.2 or later) and the dialog box above will pop in. If you click Learn More, you'll end up at Apple's tech note; don't worry, you can come back and get the files later by relaunching iPhoto or by clicking the MobileMe entry in your iPhoto source list. When you do, iPhoto will download all